Tubeaxial Fan Drive Type Belt Drive Includes Drive Package Yes Includes Motor Yes Blade Diameter 48 in Nameplate Voltage 230V AC Phase 1 Motor Horsepower 5 hp Airflow @ 0.000 in SP 31 260 cfm Maximum Noise Level @ 5 Feet 64 sones Assembly Unassembled For Air Type Emergency Smoke Blade Material Steel Housing Material Steel Number of Blades 5 Number of Speeds 1 Motor Enclosure Totally Enclosed Fan Cooled Standards AMCA cULus Bolt Circle Diameter 50 1/4 in